Nissan Altima L32. Manual - part 257

U0140 CAN COMM CIRCUIT

EC-149

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

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U0140 CAN COMM CIRCUIT

Description

INFOID:0000000004529332

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-

tiplex communication line with high data communication speed and excellent error detection ability. Many elec-

tronic control units are equipped onto a vehicle, and each control unit shares information and links with other

control units during operation (not independent). In CAN communication, control units are connected with 2

communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.

Each control unit transmits/receives data but selectively reads required data only.

DTC Logic

INFOID:0000000004351807

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON and wait at least 3 seconds.

2. Check DTC.
Is DTC detected?

YES

>>

EC-149, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000004529333

Go to 

LAN-16, "Trouble Diagnosis Flow Chart"

.

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

U0140

Lost communication 
with BCM

When ECM is not transmitting or receiving CAN com-
munication signal of OBD (emission related diagno-
sis) with BCM for 2 seconds or more.

• CAN communication line between 

BCM and ECM
(CAN communication line is open or 
shorted)

EC-150

< COMPONENT DIAGNOSIS >

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U1001 CAN COMM CIRCUIT

U1001 CAN COMM CIRCUIT

Description

INFOID:0000000004529334

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-

tiplex communication line with high data communication speed and excellent error detection ability. Many elec-

tronic control units are equipped onto a vehicle, and each control unit shares information and links with other

control units during operation (not independent). In CAN communication, control units are connected with 2

communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.

Each control unit transmits/receives data but selectively reads required data only.

DTC Logic

INFOID:0000000004468211

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON and wait at least 3 seconds.

2. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>>

EC-150, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000004529335

Go to 

LAN-16, "Trouble Diagnosis Flow Chart"

.

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

U1001

CAN communication 
line

When ECM is not transmitting or receiving CAN com-
munication signal other than OBD (emission related 
diagnosis) for 2 seconds or more.

• Harness or connectors

(CAN communication line is open or 
shorted)

P0011 IVT CONTROL

EC-151

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P0011 IVT CONTROL

DTC Logic

INFOID:0000000004349193

DTC DETECTION LOGIC

NOTE:

If DTC P0011 is displayed with DTC P0075, first perform the trouble diagnosis for 

EC-362, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test. 

TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is between 10V and 16V at

idle.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE-I

With CONSULT-III

1. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT-III.

2. Start engine and warm it up to the normal operating temperature.

3. Maintain the following conditions for at least 6 consecutive seconds. Hold the accelerator pedal as steady

as possible.

CAUTION:

Always drive at a safe speed.

4. Stop vehicle with engine running and let engine idle for 10 seconds.

5. Check 1st trip DTC.

With GST

Follow the procedure “With CONSULT-III” above.
Is 1st trip DTC detected?

YES

>> Go to 

EC-152, "Diagnosis Procedure"

NO

>> GO TO 3.

3.

PERFORM DTC CONFIRMATION PROCEDURE-II

With CONSULT-III

1. Maintain the following conditions for at least 20 consecutive seconds.

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

P0011

Intake valve timing 
control performance

There is a gap between angle of target and 
phase-control angle degree.

• Crankshaft position sensor (POS)
• Camshaft position sensor (PHASE)
• Intake valve control solenoid valve
• Accumulation of debris to the signal pick-up 

portion of the camshaft

• Timing chain installation
• Foreign matter caught in the oil groove for in-

take valve timing control

ENG SPEED

1,200 - 2,000 rpm

COOLAN TEMP/S

More than 60

°C (140°F)

B/FUEL SCHDL

More than 3.5 msec

Shift lever

D position (CVT)
5th position (M/T)

EC-152

< COMPONENT DIAGNOSIS >

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P0011 IVT CONTROL

CAUTION:

Always drive at a safe speed.

2. Check 1st trip DTC.

With GST

Follow the procedure “With CONSULT-III” above.
Is 1st trip DTC detected?

YES

>> Go to 

EC-152, "Diagnosis Procedure"

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000004349194

1.

CHECK OIL PRESSURE WARNING LAMP

1. Start engine.

2. Check oil pressure warning lamp and confirm it is not illumi-

nated.

Is oil pressure warning lamp illuminated?

YES

>> Go to 

LU-9, "Inspection"

.

NO

>> GO TO 2.

2.

CHECK INTAKE VALVE TIMING CONTROL SOLENOID VALVE

Refer to 

EC-153, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Replace intake valve timing control solenoid valve.

3.

CHECK CRANKSHAFT POSITION SENSOR (POS)

Refer to 

EC-281, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace crankshaft position sensor (POS).

4.

CHECK CAMSHAFT POSITION SENSOR (PHASE)

Refer to 

EC-284, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace camshaft position sensor (PHASE).

5.

CHECK CAMSHAFT (INTAKE)

Check the following.

ENG SPEED

1,700 - 3,175 rpm (A constant rotation is maintained.)

COOLAN TEMP/S

More than 70

°C (221°F)

Shift lever

1st or 2nd position

Driving location uphill

Driving vehicle uphill
(Increased engine load will help maintain the driving 
conditions required for this test.)

PBIA8559J